Large bearing oil mist collecting device

Abstract

The utility model relates to a large bearing oil mist collecting device which comprises a high-voltage electric field oil mist purifier, an axial flow fan, two connecting pipelines and an oil scavenger pump, one connecting pipeline is communicated with an air inlet of a bearing oil basin, the axial flow fan and an air outlet of the high-voltage electric field oil mist purifier, and the other connecting pipeline is communicated with an air outlet of the high-voltage electric field oil mist purifier. The other one is communicated with an air outlet of the bearing oil basin and an air inlet of the high-voltage electric field oil mist purifier; the high-voltage electric field oil mist purifier is a closed box body, an electric field polar plate mechanism for ionization oil removal is arranged in the closed box body, and an oil discharge hole, an oil storage box and an oil return pump are arranged at the bottom of the electric field polar plate mechanism. The closed circulation mode and electrostatic adsorption after ionization are combined, oil mist is captured and collected, air with oil drops captured and collected and the oil drops captured and collected return to a generator bearing oil basin through the axial flow fan and the oil return pump, and the purposes of oil and gas separation and oil return are achieved in the closed circulation mode.

Description

Technical Field

[0001] The utility model relates to a large bearing oil mist collection device, in particular to a device for collecting oil mist generated during the operation of high-speed rotating bearings (especially thrust bearings and guide bearings). The device can effectively collect and eliminate oil mist, eliminating the impact of oil mist on the environment and equipment operation. Background Art

[0002] During the operation of large bearings of large generator sets or motor sets, lubricating oil is generally used for lubrication and heat dissipation. Due to high-speed rotation and heat generation, the lubricating oil will evaporate due to the increase in temperature to form oil mist and overflow. The formed oil mist is sucked into the cooling air duct by the rotor fan, and finally gathers in the rotor and stator windings of the generator, and penetrates into the insulating material, reducing the insulation level of the stator and rotor, posing a threat to the safe operation of the generator set and increasing the safety risk. If it is a suspended generator, the thrust bearing and the rotor slip ring are installed together, and the oil mist will gather on the slip ring and carbon brush, and mix with the long-term worn carbon powder to form sludge, which directly affects the insulation of the slip ring to the ground; it is necessary to shut down regularly to clean this sludge, which increases labor costs and labor intensity, and directly affects the normal operation of the production.

[0003] The overflowed oil mist not only affects production safety, but also pollutes the working environment, pollutes the secondary circuit of the control cabinet, affects the normal operation of the equipment, and even causes equipment failure.

[0004] At present, the traditional solutions mainly include: first, installing ventilation or filtering devices in the surrounding environment of the equipment operation to extract the oil mist and discharge it to the outside, which will pollute the air and cause the dust in the air to enter the bearing oil pan, pollute the bearing lubricating oil, and then affect the safe operation of the bearing. After the equipment has been running for a period of time, it needs to be manually cleaned, which is time-consuming and labor-intensive. What is more serious is that when cleaning the oil stains on the surface of the equipment, it is generally carried out when the equipment is running, which has great safety hazards and high safety risks; another way is sealing, that is, using contact sealing to reduce oil mist overflow, and designing and installing a contact sealing device at the contact position between the bearing oil pan cover and the main shaft to prevent oil mist from overflowing as much as possible. However, the sealing strip of this device and the main shaft are in long-term uninterrupted operation friction, the sealing strip is greatly worn, and the frequency of replacing the sealing strip is high. At the same time, the friction between the main shaft and the sealing strip will also cause the sealing strip to wear and deform. In severe cases, it can only be replaced, which affects production and increases operating costs. Utility Model Content

[0005] The utility model aims to provide a large-scale bearing oil mist collection device, which adopts a closed circulation method combined with electrostatic adsorption to realize the capture and collection of oil mist. The air after the oil droplets are captured and collected and the captured oil droplets are returned to the generator bearing oil basin through an axial flow fan and an oil return pump, thereby achieving the purpose of oil and gas separation and closed-loop circulation.

[0006] The technical solution of the utility model is:

[0007] A large bearing oil mist collection device comprises a high-voltage electric field oil mist purifier 2, an axial flow fan 3 and a connecting pipe; the air vents on the upper part of the bearing oil basin are evenly divided into two groups, each group is provided with two air outlets, the two air outlets are connected by pipes and a tee, one group is used as the bearing oil basin air outlet 14, and the other group is used as the bearing oil basin air inlet 15; the connecting pipe is provided with two groups, one group connects the bearing oil basin air outlet 14 and the air inlet 21 of the high-voltage electric field oil mist purifier 2, and the other group connects the exhaust port 22 of the high-voltage electric field oil mist purifier 2, the axial flow fan 3 and the bearing oil basin air inlet 15; the high-voltage electric field oil mist purifier 2 comprises a purifier box, an electric field plate mechanism 23 for electrostatic oil removal after ionization is installed inside the box, an oil discharge hole 24 and an oil storage box 25 are provided at the bottom of the electric field plate mechanism 23, and an oil return pump 26 and an oil return pipe 27 connecting the oil return pump 26 and the bearing oil basin are provided below the oil storage box 25.

[0008] Preferably, the bottom of the oil storage box 25 is in an inverted cone shape, and the return oil pump 26 is connected to the bottom of the oil storage box 25 through a pipeline. When the return oil pump 26 is turned off, the high-voltage electric field oil mist purifier 2 is in a closed state as a whole. When the return oil pump 26 is started, the oil collected in the oil storage box 25 can be returned to the bearing oil basin through the return oil pipe 27.

[0009] Preferably, it also includes an electronic control unit 20 and an oil level sensor located in the oil storage box 25. The electronic control unit 20 is electrically connected to the axial flow fan 3, the oil level sensor and the oil return pump 26 respectively. The electronic control unit 20 detects the oil level in the oil storage box 25 through the oil level sensor. When the oil level reaches a set upper limit value, the axial flow fan 3 is controlled to stop running and the oil return pump 26 is started. When the oil level reaches a set lower limit value, the oil return pump 26 is automatically shut down, and the axial flow fan 3 starts running at the same time.

[0010] Preferably, the electronic control unit 20 also has the function of supplying power to the high-voltage electric field oil mist purifier 2, and its rated input voltage is 220VAC±10%, rated frequency is 50 / 60Hz, output voltage H: 16Kv / L: 8kV, and rated power is 300W.

[0011] Preferably, the air inlet 21 is located on a side of the high-voltage electric field oil mist purifier 2 , and the air outlet 22 is located on another side of the high-voltage electric field oil mist purifier 2 opposite to the air inlet 21 .

[0012] Preferably, the flow direction of the oil mist in the electric field plate mechanism 23 is consistent with the flow direction of the air inlet 21 to the exhaust port 22 .

[0013] Preferably, the axial flow fan 3 is a variable frequency fan.

[0014] Preferably, the connecting pipe is a plastic hose made of PE material that is easy to install.

[0015] The beneficial effects of the utility model include:

[0016] (1) Bearing oil mist will reduce the insulation of the collector ring to the ground, requiring shutdown to clean the collector ring, resulting in economic losses; long-term immersion of oil mist in the stator and rotor insulation layer will damage the insulation level, causing insulation breakdown and serious accidents; bearing oil mist will be emitted in the factory, causing pollution to the excitation system and other control equipment, causing other faults. After the use of the device of the utility model, such problems are well solved;

[0017] (2) This device can be used for oil mist absorption of various large generators and high-voltage motors. It has a simple structure, is easy to operate, and is easy to promote;

[0018] (3) This device controls the oil mist generated by the bearing to be released into the atmosphere, thus preventing the polluted air from causing harm to the health of the workers and also preventing the emission of harmful substances from causing harm to the environment;

[0019] (4) Reduce the maintenance workload of staff and reduce their labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : Schematic diagram of application scenario of the bearing oil mist collection device of the present invention.

[0021] Figure 2 : Schematic diagram of the structure of the bearing oil mist collection device of the present utility model.

[0022] The reference numerals in the figure are:

[0023] 1-bearing oil pan, 11-bearing, 12-condenser, 13-oil level, 14-bearing oil pan air outlet, 15-bearing oil pan air inlet;

[0024] 2-high voltage electric field oil mist purifier, 20-electronic control unit, 21-air inlet, 22-exhaust port, 23-electric field plate mechanism, 24-oil drain hole, 25-oil storage box, 26-oil return pump, 27-oil return pipe;

[0025] 3-Axial flow fan. DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2As shown, a large bearing oil mist collection device includes a high-voltage electric field oil mist purifier 2, an axial flow fan 3 and a connecting pipe; the air vents on the upper part of the bearing oil basin are evenly divided into two groups, each group is provided with two air outlets, and the two air outlets are connected by pipes and tees, one group is used as the bearing oil basin outlet 14, and the other group is used as the bearing oil basin inlet 15; the connecting pipe is provided with two groups, one group connects the bearing oil basin outlet 14 and the air inlet 21 of the high-voltage electric field oil mist purifier 2, and the other group connects the exhaust port 22 of the high-voltage electric field oil mist purifier 2, the axial flow fan 3 and the bearing oil basin inlet 15; the high-voltage electric field oil mist purifier 2 includes a purifier box, which is equipped with an electric field plate mechanism 23 for electrostatic oil removal after ionization, an oil discharge hole 24 and an oil storage box 25 are provided at the bottom of the electric field plate mechanism 23, and an oil return pump 26 and an oil return pipe 27 connecting the oil return pump 26 and the bearing oil basin are provided below the oil storage box 25.

[0027] The bottom of the oil storage box 25 is in an inverted cone shape, and the return oil pump 26 is connected to the bottom of the oil storage box 25 through a pipeline. When the return oil pump 26 is turned off, the high-voltage electric field oil mist purifier 2 is in a closed state as a whole. When the return oil pump 26 is started, the oil collected in the oil storage box 25 can be returned to the bearing oil basin through the return oil pipe 27.

[0028] It also includes an electronic control unit 20 and an oil level sensor (not shown in the figure) located in the oil storage box 25. The electronic control unit 20 is electrically connected to the axial flow fan 3, the oil level sensor and the oil return pump 26 respectively. The electronic control unit 20 detects the oil level in the oil storage box 25 through the oil level sensor. When the oil level reaches a set upper limit, the axial flow fan 3 is controlled to stop running and the oil return pump 26 is started. When the oil level reaches a set lower limit, the oil return pump 26 is automatically shut down, and the axial flow fan 3 starts running at the same time.

[0029] The axial flow fan 3 serves as the power of the oil mist closed cycle, realizing the closed cycle of the oil mist of the large bearing from "bearing oil basin air outlet 14 - air inlet 21 of the high-voltage electric field oil mist purifier 2 - high-voltage electric field oil mist purifier 2 - exhaust port 22 of the high-voltage electric field oil mist purifier 2 - bearing oil basin air inlet 15".

[0030] The air inlet 21 is located on a side of the high-voltage electric field oil mist purifier 2 , and the air outlet 22 is located on another side of the high-voltage electric field oil mist purifier 2 opposite to the air inlet 21 .

[0031] The high-voltage electric field oil mist purifier 2 is internally equipped with a vertical adsorption grid, which forms a high-voltage electric field capable of adsorbing oil mist after being energized. The oil mist adsorbed by the high-voltage electric field condenses to form oil droplets that accumulate and drip into the oil storage box 25, completing the collection of the oil mist. The flow direction of the oil mist in the vertical adsorption grid of the high-voltage electric field oil mist purifier 2 is consistent with the flow direction of the air inlet 21 and the exhaust port 22. The power of the axial flow fan can be selectively purchased according to the amount of oil mist produced by the operation of the generator bearing. As an embodiment, a variable frequency axial flow fan is preferably used (such as: energy-saving variable frequency duct fan produced by Shenzhen Hongguan Motor Co., Ltd.: specification model HF-100PE, rated voltage 220VAC, rated power 16.4W, 0.25A2200r / min 198m 3 / h 156pa).

[0032] The high-voltage electric field oil mist purifier can be selected and purchased according to the amount of oil mist generated by the generator bearing. As an example, you can choose the Zhuolek oil fume purifier produced by Zhengzhou Yute Electronic Technology Co., Ltd.: specification model MDYQ-300, rated voltage 220VAC±10%, rated frequency 50 / 60Hz, output voltage H: 16kV, L: 8kV, rated power 300W.

[0033] As an embodiment, the connecting pipe is selected to be a plastic hose made of PE material for easy installation, and the diameter is determined according to the inlet and outlet diameters of the high-voltage electric field oil suction device and the axial flow fan (for example, the preferred pipe diameter is 100 mm).

[0034] As an embodiment, the electric control unit 20 can select PLC (or automatic instruments such as loop controller), relay and power supply module of oil fume purifier to realize its function. The oil level sensor can select high and low oil level to install two small float level switches. When the oil level reaches a fixed height, the electric control unit (20) stops the axial flow fan 3 and starts the oil return pump 26 to return oil through logic control; when the oil level reaches a low level, the electric control unit (20) shuts down the oil return pump 26 and restarts the axial flow fan 3 through logic control. The PLC realizing the above logic control does not involve computer programs for the method and its improvement.

[0035] As an example, the vent holes on the upper part of the bearing oil basin are evenly divided into two groups, one group is used as the air outlet, and the other group is used as the air inlet. The air outlets are connected in groups with pipes and tees and are respectively connected to the air inlet of the high-voltage electric field oil mist purifier and the exhaust port of the axial flow fan to form a closed channel.

[0036] The working principle and working process of the utility model are as follows:

[0037] 1. First, check whether the air inlet and outlet / holes connected with PE pipes are firm, and whether the elbows and joints are airtight and leak-proof; then check whether the inlet and outlet / holes of the high-voltage electric field oil mist purifier are connected correctly, whether the power is on and connected correctly, whether the oil storage box welded at the bottom of the oil drain hole is welded firmly and airtight without oil leakage, and whether the oil drain valve is closed; then check whether the inlet and outlet / holes of the axial flow fan are connected correctly, whether the power is on and connected correctly; finally, check whether the connected pipes are firm and sealed. Confirm that the entire set of oil mist suction device is connected normally.

[0038] 2. After the large bearing oil of the generator set is running normally, the generator operation relay automatically starts the high-voltage electric field oil mist purifier and the axial flow fan. In this way, the oil mist generated by the high-speed operation of the generator bearing is sucked out from the air outlet / hole of the bearing oil basin, and enters the oil mist high-voltage electric field oil mist purifier from the air inlet / hole of the high-voltage electric field through the connected pipeline. The oil mist is captured by the high-voltage electric field to form oil droplets that drip / flow into the oil storage box from the oil discharge hole. The air after absorbing the oil mist passes through the axial flow fan from the air outlet / hole of the high-voltage electric field unit, and finally re-enters the bearing oil basin through the air inlet / hole of the bearing oil basin, completing an oil mist absorption cycle; in this way, the oil mist is captured and recycled into the oil storage box in a cycle. When the oil level in the oil storage box reaches a certain height, the electronic control unit 20 automatically turns off the axial flow fan and the high-voltage electric field oil mist purifier, turns on the oil return pump 26, and returns the oil in the oil storage to the bearing oil basin. When the oil level reaches a low level, the electronic control unit 20 shuts down the oil return pump 26 through logic control, restarts the axial flow fan 3 and the high-voltage electric field oil mist purifier, and then repeats the process to achieve the purpose of oil mist absorption.

[0039] 3. During operation, adjust the output voltage of the high-voltage electric field oil mist purifier. Select a relatively low voltage as much as possible while meeting the oil mist removal effect. This can reduce power and extend the life and maintenance time of the high-voltage electric field oil mist purifier. Similarly, adjust the speed of the variable frequency axial flow fan to operate at an appropriate speed.

[0040] 4. The main equipments are all standard products, and the appropriate products can be selected according to the situation of the generator set, which is convenient for daily maintenance.

[0041] 5. The start and stop of the axial flow fan and the high-voltage electric field oil mist purifier can further interlock the electronic control unit 20 with the generator state control, connect to the entire unit monitoring system, the generator no-load state and power generation state, start or shut down the axial flow fan and the high-voltage electric field oil mist purifier, and stop the device operation at the same time when the unit is shut down.

Claims

1. A large bearing oil mist collection device, characterized in that: It comprises a high-voltage electric field oil mist purifier (2), an axial flow fan (3), a connecting pipeline and an oil return pump (26); The vent holes on the upper part of the bearing oil basin are evenly divided into two groups, each group is provided with two air outlets, and the two air outlets are connected by a pipe and a tee, one group is used as the bearing oil basin air outlet (14), and the other group is used as the bearing oil basin air inlet (15); The connecting pipes are provided with two groups, one group connecting the air outlet (14) of the bearing oil basin and the air inlet (21) of the high-voltage electric field oil mist purifier (2), and the other group connecting the air outlet (22) of the high-voltage electric field oil mist purifier (2), the axial flow fan (3) and the air inlet (15) of the bearing oil basin; The high-voltage electric field oil mist purifier (2) comprises a purifier housing, inside which is mounted an electric field plate mechanism (23) for electrostatic oil removal after ionization, an oil discharge hole (24) and an oil storage box (25) are arranged at the bottom of the electric field plate mechanism (23), and below the oil storage box (25) is arranged an oil return pump (26) and an oil return pipe (27) connecting the oil return pump (26) and a bearing oil pan.

2. The large bearing oil mist collection device according to claim 1 is characterized in that: The bottom of the oil storage box (25) is in an inverted cone shape. The oil return pump (26) is connected to the bottom of the oil storage box (25) through a pipeline. When the oil return pump (26) is turned off, the high-voltage electric field oil mist purifier (2) is in a sealed state as a whole. When the oil return pump (26) is started, the oil collected in the oil storage box (25) can be returned to the bearing oil basin through the oil return pipe (27).

3. The large bearing oil mist collection device according to claim 1 is characterized in that: The invention also comprises an electric control unit (20) and an oil level sensor located in the oil storage box (25). The electric control unit (20) is electrically connected to the axial flow fan (3), the oil level sensor and the oil return pump (26) respectively. The electric control unit (20) detects the oil level in the oil storage box (25) through the oil level sensor. When the oil level reaches a set upper limit value, the axial flow fan (3) is controlled to stop running and the oil return pump (26) is started. When the oil level reaches a set lower limit value, the oil return pump (26) is automatically turned off and the axial flow fan (3) is started and operated at the same time.

4. The large bearing oil mist collection device according to claim 3 is characterized in that: The electric control unit (20) also has the function of supplying power to the high-voltage electric field oil mist purifier (2), with a rated input voltage of 220VAC±10%, a rated frequency of 50 / 60Hz, an output voltage H:16Kv / L:8kV, and a rated power of 300W.

5. The large bearing oil mist collection device according to claim 1 is characterized in that: The air inlet (21) is located on a side of the high-voltage electric field oil mist purifier (2), and the air outlet (22) is located on another side of the high-voltage electric field oil mist purifier (2) opposite to the air inlet (21).

6. The large bearing oil mist collection device according to claim 5 is characterized in that: The flow direction of the oil mist in the electric field plate mechanism (23) is consistent with the flow direction of the air inlet (21)-exhaust port (22).

7. The large bearing oil mist collection device according to any one of claims 1 to 6, characterized in that: The axial flow fan (3) is a variable frequency fan.

8. The large bearing oil mist collection device according to any one of claims 1 to 6, characterized in that: The connecting pipe is a plastic hose made of PE material that is easy to install.

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